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Leisure Lakes Bikes£79.99Visit shop Shimano Ultegra BR-RS811-R BB/Chainstay Direct Mount Rear Brake Caliper Grey
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The Shimano Ultegra BR-RS811 is an ideal choice for road cyclists seeking a high-performance, aerodynamic braking solution for frames utilizing direct-mount standards on the bottom bracket or chainstays. This caliper offers an excellent balance of stiffness and low weight, providing consistent stopping power and a linear, responsive feel. While it delivers elite-level control, users must ensure their bike frame is specifically designed for direct-mount components and that they use compatible Super SLR brake levers to maintain the correct leverage ratio.
| Series | Ultegra |
|---|---|
| Model Part Number | BRRS811R |
| Brand | SHIMANO |
No, it is designed exclusively for frames with direct-mount brake bosses on the chainstays or bottom bracket.
The BR-RS811 is designed to accommodate tires up to 28mm (28C) in width.
No, the cartridge-style shoes allow you to slide out old pads and slide in new ones using a standard hex key.
It is not recommended. You must use Shimano Super SLR-EV compatible levers to ensure the leverage ratio is correct for the caliper's design.
This specific model, BR-RS811R, is designed for the rear position.
Verify you are using Super SLR-EV compatible levers and check for cable tension or housing compression.
Check and adjust the pad toe-in using the convex washers; clean the rim surface and brake pads to remove debris.
Check for cable friction and ensure the centering adjustment screw on the caliper is tuned properly.
Installation of the BR-RS811 requires a frame compatible with direct-mount brake posts. Ensure that the mounting bolts are torqued to the manufacturer's frame specifications to prevent damage to the frame or the caliper hardware.
Compatibility is strictly limited to Shimano Super SLR-EV road levers. Using non-compatible levers will result in an incorrect leverage ratio, causing either a mushy feel or reduced stopping power. When setting up the pads, utilize the integrated convex washers to achieve proper toe-in, which prevents brake squeal. Regularly inspect the cartridge pads for wear and keep the pivot points clean of road grime and debris to ensure smooth operation throughout the life of the component.
